The Urban Dictionary T-Shirt

Taking a shit. In British slang, the numbers are based on rhymes - number two for poo and number three for pee. In American slang, the numbers are not based on any rhyme and they are often referred to by a host whose guest has requested to use their bathroom. The options are arranged in ascending order based on which activities the host would be the least willing to allow in their bathroom: Number one is pissing, number two is shitting, and number three is masturbating (or in some circles, diarrhea).

"Can I use your bathroom?"
-"Number one or number two?"
"Number two."
-"No fucking way, go shit up your own bathroom."